CN110000187B - Harmless treatment method for barium slag - Google Patents
Harmless treatment method for barium slag Download PDFInfo
- Publication number
- CN110000187B CN110000187B CN201910211769.0A CN201910211769A CN110000187B CN 110000187 B CN110000187 B CN 110000187B CN 201910211769 A CN201910211769 A CN 201910211769A CN 110000187 B CN110000187 B CN 110000187B
- Authority
- CN
- China
- Prior art keywords
- barium
- barium slag
- slag
- flue gas
- gas desulfurization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
Abstract
The invention provides a barium slag innocent treatment method which is characterized by comprising the following steps: (1) draining barium residues to be treated; (2) flue gas desulfurization gypsum is added into the drained barium slag. After the barium slag is subjected to harmless treatment by adopting the method disclosed by the invention, the concentration of leached toxic barium ions can be greatly reduced and the corrosivity is reduced.
Description
Technical Field
The invention belongs to the field of treatment and comprehensive utilization of industrial waste residues, and particularly relates to a method for performing harmless treatment on barium residues by circularly and comprehensively utilizing flue gas desulfurization gypsum.
Background
The barium slag is waste slag produced by using barite as a raw material and leaching the barite through high-temperature carbon reduction or barium slag obtained by manufacturing other barium salts. China has become the most important barium salt production base all over the world, and the barium slag mainly contains acid-soluble barium and water-soluble barium. According to the national records of dangerous waste, the barium slag belongs to dangerous solid waste and is stacked for a long time, so that a large amount of land is occupied, and the environment is polluted. Therefore, the harmless treatment and the comprehensive recycling of the barium slag are important aspects of the research on the barium slag at present.
The flue gas desulfurization gypsum is obtained by desulfurizing sintering flue gas, boiler flue gas of a thermal power plant and the like by a limestone-gypsum method, wherein the limestone-gypsum method flue gas desulfurization accounts for more than 70 percent of wet flue gas desulfurization, a large amount of desulfurization gypsum is generated every year, and a large amount of desulfurization gypsum is discarded and stockpiled, so that a large amount of land is occupied, and the environment is polluted. How to change waste into valuable and comprehensively utilize the waste is also a main research topic in recent years in China.
At present, the barium slag innocent technology mainly adopts mirabilite and ferrous sulfate to treat barium slag, and has the main defects of high treatment cost and the introduction of sodium ions and iron ions which are not beneficial to the application of downstream industries.
Disclosure of Invention
The invention aims to provide a method for harmless treatment of barium slag by recycling and comprehensively utilizing flue gas desulfurization gypsum, aiming at the problems that the existing barium slag harmless treatment method is high in treatment cost and brings sodium ions and iron ions which are not beneficial to downstream industries.
Specifically, the invention is realized by the following technical scheme:
a barium slag innocent treatment method comprises the following steps:
(1) draining barium residues to be treated;
(2) flue gas desulfurization gypsum is added into the drained barium slag.
Further, the barium slag to be treated is produced by leaching barite and barium sulfide black ash produced by roasting anthracite with hot water.
Further, sulfur dioxide generated by roasting the barite and the anthracite is absorbed by limestone slurry, and flue gas desulfurization gypsum is obtained through dehydration and is used in the step (2).
Further, the calcium sulfate content of the flue gas desulfurization gypsum is 70-100%, preferably 85-100%.
Further, in the step (1), draining the barium residues to be treated, and collecting draining water, and filtering the draining water to leach the barium sulfide black ash.
Further, in the step (1), naturally draining the barium residue for 0.5-5 days, preferably 1-2 days.
Further, the water content of the drained barium slag is 5-30%, and preferably 18-25%.
Further, in the step (2), the addition amount of the flue gas desulfurization gypsum is 5-25%, preferably 14-20% by weight of the drained barium slag.
Further, in the step (2), flue gas desulfurization gypsum is added into the drained barium slag, and the mixture is stirred for 1-60 minutes, preferably 5-20 minutes.
Compared with the prior art, the technical scheme of the invention at least has the following beneficial effects:
the harmless treatment method of the barium slag realizes the purpose of treating wastes with wastes, can greatly reduce the harmless cost of the barium slag through process implementation, can completely realize that toxic barium ions and corrosive pH value leached from the barium slag are far lower than the national environmental protection standard, and calcium ions are beneficial to the comprehensive utilization of downstream industries such as cement, brick making and the like.
Drawings
FIG. 1 is a process flow diagram of a preferred embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention, but the present invention is not limited thereto. Unless otherwise specified, "%" in the present invention means "% by weight".
In order to solve the problems that the existing barium slag innocent treatment method has high treatment cost and sodium ions and iron ions are not beneficial to downstream industries, the invention provides a method for carrying out innocent treatment on barium slag by circularly and comprehensively utilizing flue gas desulfurization gypsum, which comprises the following steps: (1) draining barium residues to be treated; (2) flue gas desulfurization gypsum is added into the drained barium slag.
The treatment method mainly aims at barium slag generated in the process of preparing barium salt by taking barite as a raw material and anthracite as a reducing agent. In a preferred embodiment, as shown in fig. 1, the barium slag to which the barium slag harmless treatment method of the present invention is directed is barium slag obtained by hot water leaching barium sulfide black ash obtained by roasting barite and anthracite coal, and specifically, for example, the barium slag to be treated is produced as follows:
mixing the crushed barite and anthracite according to the weight ratio of 100: (15-25), uniformly mixing, conveying to a converter, roasting at high temperature (1000-1400 ℃) to obtain barium sulfide black ash, conveying the barium sulfide black ash to a leaching tank, adding hot water (for example, 75 ℃) into the tank to leach barium sulfide, wherein the content of water-soluble barium sulfide in the leached barium sulfide black ash is lower than 0.6% (by weight), and thus obtaining the barium slag to be treated. The barium sulfide solution obtained by leaching is used for preparing barium salt.
In the above process, the following chemical reactions are mainly involved:
BaSO4+2C→BaS+2CO2
S2 2-+2O2→2SO2
BaS+H2O→Ba(OH)2+Ba(HS)2
as shown in fig. 1, in a preferred embodiment, the barium slag innocent treatment method of the present invention comprises:
first, the barium sludge to be treated is drained.
The draining can be natural draining, and the barium residue to be treated can be naturally drained for 0.5-5 days, preferably 1-2 days.
For example, the barium slag to be treated is transported to a temporary barium slag field for natural draining, and only 0.5-5 days (preferably 1-2 days) of natural draining are needed. Preferably, the drained water generated in the process of draining the barium slag to be treated is collected, filtered and then conveyed back to the barium sulfide black ash leaching system through a pipeline to be used as leaching water, so that the recycling is realized. The barium slag after draining does not need to adopt a special dehydration process, can be directly transferred to the barium slag for harmless treatment, belongs to fresh barium slag, has uniform and loose granularity, does not need to add water, and has the water content of 5-30 percent (weight) which is suitable for harmless treatment of the barium slag. When the barium slag is naturally drained for 1-2 days, the water content of the barium slag is 18-25%, and the barium slag is particularly suitable for subsequent treatment.
Then, flue gas desulfurization gypsum is added to the drained barium slag.
The calcium sulfate content of the flue gas desulfurization gypsum can be 70-100% (by weight), and preferably 85-100%. The addition amount of the flue gas desulfurization gypsum is 5-25%, preferably 14-20% by weight of the drained barium slag. And (3) after adding the flue gas desulfurization gypsum, stirring for 1-60 minutes, preferably 5-20 minutes, so that the flue gas desulfurization gypsum and the flue gas desulfurization gypsum are fully reacted.
The flue gas desulfurization gypsum can be self-produced flue gas desulfurization gypsum or flue gas desulfurization gypsum of a thermal power plant or other chemical plants. Preferably, the flue gas desulfurization gypsum adopted by the invention is self-produced flue gas desulfurization gypsum, namely, by utilizing a limestone-gypsum method, sulfur dioxide generated in the roasting process of barite and anthracite is absorbed by limestone slurry, and the flue gas desulfurization gypsum is obtained by dehydration through a vacuum belt dehydrator. The process mainly involves the following chemical reactions:
CaCO3+SO2+H2O→CaSO4+CO2+H2O
and (3) performing leachate toxic barium ion and pH measurement on the mixture subjected to harmless treatment according to GB 5085.3-2007 'hazardous waste identification standard-leaching toxicity identification' and GB 5085.1-2007 'hazardous waste identification standard-corrosivity identification'. The detection result of the barium residue after harmless treatment is that the leaching toxic barium ion value of the barium residue is 50mg/L, pH is 12.0, and the detection result is far lower than the concentration limit value of the hazardous components and the pH value requirement of the leachate in GB 5085.3-2007 hazardous waste identification standard-leaching toxicity identification and GB 5085.1-2007 hazardous waste identification standard-corrosivity identification.
In addition, the barium slag innocent treatment method preferably adopts self-produced flue gas desulfurization gypsum, thereby realizing comprehensive economic and environmental benefits of treating waste by waste, comprehensively utilizing solid waste and basically discharging zero waste. Because the harmful impurities added in the barium slag harmlessness process in downstream application such as sodium ions, iron ions and the like are avoided, the method is beneficial to downstream application in industries such as cement, brick making, wall filling and the like, and is more beneficial to comprehensive utilization of the generated mixture. And after the barium slag is naturally drained, a dehydration device is not needed, flue gas desulfurization gypsum is directly added to carry out harmless treatment on the barium slag, the process is simple and practical, and the cost is low.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.
Example one
The barium slag targeted by this implementation results from the following process:
mixing 920.2t (the content is 75 percent and the barium yield is 74 percent) of crushed barite and 184.04t (the ash content is 35 percent) of anthracite uniformly according to the weight ratio of 100:20, then conveying the mixture to a converter, roasting at high temperature (1200 ℃, and simultaneously uniformly spraying 64.41t (the ash content is 35 percent and the barite is 100:7)) of bituminous coal to obtain barium sulfide black ash, conveying the barium sulfide to a leaching tank, simultaneously adding hot water heated to 75 ℃ into the tank for leaching the barium sulfide, wherein the content of water-soluble barium sulfide in the leached barium sulfide black ash is lower than 0.23 percent, and thus obtaining the barium slag to be treated. Meanwhile, in the process, sulfur dioxide-containing flue gas generated by roasting the barite at high temperature is absorbed by limestone slurry, and is dehydrated by a vacuum belt dehydrator to obtain 119.88t of flue gas desulfurization gypsum (the moisture content is 11 percent, and the weight content of calcium sulfate is 86.3 percent).
The barium slag innocent treatment process of the implementation is as follows:
transferring the barium slag to be treated to a temporary barium slag field for natural draining for 1 day to obtain 602t (the moisture content is 17), collecting and filtering the drained water, and conveying the collected and filtered barium slag back to a black ash leaching system for recycling, wherein the drained barium slag does not need a special dehydration process. The weight of the barium residue is 602t (moisture content is 17 percent), wherein the concentration of leached toxic barium ions is 1554ppm, and the pH value is 11.6.
Adding 119.88t parts of flue gas desulfurization gypsum into 602t parts of barium slag at a ratio of 100:20 (barium slag: flue gas desulfurization gypsum). And mixing the barium slag added with the flue gas desulfurization gypsum for 5 minutes by a spiral conveying stirring device or an automatic turnover device to obtain a uniformly mixed barium slag-desulfurization gypsum mixture.
The mixture is detected according to HJ/T299-2007 sulfuric acid-nitric acid method for leaching toxicity of solid wastes, the concentration of leached toxicity barium ions is 30.5ppm, and the pH value is 9.5.
Example two
The barium slag targeted by this implementation results from the following process:
mixing 1278.34t (with the content of 75 percent and the barium yield of 74 percent) of crushed barite and 191.46t (with the ash content of 35 percent) of anthracite uniformly according to the proportion of 100:15, conveying the mixture to a converter, roasting at high temperature (1200 ℃, and simultaneously adding 89.48t (with the ash content of 35 percent and the barite: 100:7)) of bituminous coal to obtain barium sulfide black ash, conveying the barium sulfide to a leaching tank, adding hot water heated to 75 ℃ into the tank for leaching barium sulfide, wherein the content of water-soluble barium sulfide in the leached barium sulfide black ash is lower than 0.19 percent, and thus obtaining the barium slag to be treated. Meanwhile, in the process, the flue gas containing sulfur dioxide generated by roasting the barite at high temperature is absorbed by limestone slurry, and is dehydrated by a vacuum belt dehydrator to obtain flue gas desulfurization gypsum 117.54t (CaSO)484.5 percent of the weight content and the weight of waterAmount content 14%).
The barium slag innocent treatment process of the implementation is as follows:
transferring the barium slag to a temporary barium slag field for naturally draining for 0.5 day to obtain 839.58t (moisture content is 20 percent) of the barium slag, collecting and filtering the drained water, conveying the drained barium slag back to a black ash leaching system through a pipeline for recycling, and eliminating the need of adopting a special dehydration process for the drained barium slag. The weight of the barium residue is 839.58t (moisture content is 20 percent), wherein the concentration of leached toxic barium ions is 1888ppm, and the pH value is 12.3.
The flue gas desulfurization gypsum 117.54t is completely added into the barium slag 839.58t by a material adding device, and the mixture ratio is 100:14 (the barium slag: the flue gas desulfurization gypsum). And stirring the barium slag added with the flue gas desulfurization gypsum for 10 minutes by using a spiral conveying stirring device to obtain a uniformly mixed barium slag-desulfurization gypsum mixture.
The mixture is detected according to HJ/T299-2007 sulfuric acid-nitric acid method for leaching toxicity of solid wastes, the concentration of leached toxicity barium ions is 5.9ppm, and the pH value is 9.8.
EXAMPLE III
The barium slag targeted by this implementation results from the following process:
uniformly mixing 2523.04t (with the content of 76 percent and the barium yield of 74 percent) of crushed barite and 453.69t (with the ash content of 35 percent) of anthracite according to the proportion of 100:18, conveying the mixture to a converter, roasting at high temperature (1200 ℃, and simultaneously adding 182.97t (with the ash content of 40 percent and the barite: 100:7)) of bituminous coal to obtain barium sulfide black ash, conveying the barium sulfide to a leaching tank, adding hot water heated to 75 ℃ into the tank for leaching barium sulfide, wherein the content of water-soluble barium sulfide in the leached barium sulfide black ash is 0.38 percent, and the barium slag to be treated is obtained. Meanwhile, in the process, the flue gas containing sulfur dioxide generated by roasting the barite at high temperature is absorbed by limestone slurry, and is dehydrated by a vacuum belt dehydrator to obtain flue gas desulfurization gypsum 317.22t (CaSO)4Percent 84, moisture 12).
The barium slag innocent treatment process of the implementation is as follows:
transferring the barium slag to a temporary barium slag field for natural draining for 1.5 days to obtain 1712.90t (moisture content is 22), collecting and filtering the barium slag, conveying the barium slag back to a black ash leaching system for recycling, and not needing a special dehydration process. The weight of the barium residue is 1712.90t (moisture content is 22 percent), wherein the concentration of leached toxic barium ions is 1916ppm, and the pH value is 12.2.
Through a material adding device, the flue gas desulfurization gypsum 317.22t is completely added into the barium slag 1712.90t, and the mixture ratio is 100:18.52 (the barium slag: the flue gas desulfurization gypsum). And stirring the barium slag added with the desulfurized gypsum for 20 minutes by using a spiral conveying stirring device to obtain a uniformly mixed barium slag-desulfurized gypsum mixture.
The mixture is detected according to HJ/T299-2007 sulfuric acid-nitric acid method for leaching toxicity of solid wastes, the concentration of leached toxicity barium ions is 3.8ppm, and the pH value is 10.3.
It can be seen from the above examples that, after the harmless treatment method of barium slag of the present invention is adopted, the concentration of toxic barium ions is greatly reduced, the removal rate of harmless barium ions reaches more than 98%, and meanwhile, the corrosive pH value is also greatly reduced.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.
Claims (8)
1. A barium slag innocent treatment method is characterized by comprising the following steps:
(1) draining barium residues to be treated;
(2) adding flue gas desulfurization gypsum into the drained barium residues;
wherein, the barium slag to be treated is generated in the following process: the crushed barite and anthracite are mixed according to the weight ratio of 100: uniformly mixing the raw materials in a weight ratio of 18-25, conveying the mixture to a converter, and roasting at the temperature of 1000-; conveying the barium sulfide black ash into a leaching tank, adding hot water into the leaching tank to leach barium sulfide, wherein the content of water-soluble barium sulfide in the leached barium sulfide black ash is lower than 0.6wt%, so that barium slag to be treated is obtained and is used in the step (1); meanwhile, absorbing sulfur dioxide generated by roasting the barite and the anthracite by limestone slurry, and dehydrating to obtain flue gas desulfurization gypsum for the step (2);
in the step (2), the addition amount of the flue gas desulfurization gypsum is 5-18.52% by weight of the drained barium slag, and the water content of the drained barium slag is 15-22%.
2. The barium slag innocent treatment method of claim 1, wherein the calcium sulfate content of the flue gas desulfurization gypsum is 70-100%.
3. The barium slag innocent treatment method of claim 1, wherein the calcium sulfate content of the flue gas desulfurization gypsum is 85-100%.
4. The barium slag innocent treatment method according to claim 1, wherein in the step (1), the collected draining water is used for leaching the black barium sulfide ash after the barium slag to be treated is drained.
5. The barium slag innocent treatment method according to claim 1, wherein in the step (1), the barium slag to be treated is naturally drained for 0.5 to 5 days.
6. The barium slag innocent treatment method according to claim 1, wherein in the step (1), the barium slag to be treated is naturally drained for 1-2 days.
7. The barium slag innocent treatment method according to claim 1, wherein in the step (2), flue gas desulfurization gypsum is added into the drained barium slag, and the mixture is stirred for 1-60 minutes.
8. The barium slag innocent treatment method according to claim 1, wherein in the step (2), flue gas desulfurization gypsum is added into the drained barium slag, and the mixture is stirred for 5-20 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910211769.0A CN110000187B (en) | 2019-03-20 | 2019-03-20 | Harmless treatment method for barium slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910211769.0A CN110000187B (en) | 2019-03-20 | 2019-03-20 | Harmless treatment method for barium slag |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110000187A CN110000187A (en) | 2019-07-12 |
| CN110000187B true CN110000187B (en) | 2022-03-08 |
Family
ID=67167698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910211769.0A Active CN110000187B (en) | 2019-03-20 | 2019-03-20 | Harmless treatment method for barium slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110000187B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111320402A (en) * | 2020-03-30 | 2020-06-23 | 陕西富平生态水泥有限公司 | Cement production process capable of reducing chromium content in cement |
| CN111544822A (en) * | 2020-04-13 | 2020-08-18 | 上海圣珑环境修复技术有限公司 | Barium slag stabilizing treatment method |
| CN114956616B (en) * | 2022-06-14 | 2023-03-17 | 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所) | Method and device for preparing mixed material for cement plant by recycling barium slag |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5123956A (en) * | 1991-04-12 | 1992-06-23 | Newmont Mining Corporation | Process for treating ore having recoverable gold values and including arsenic-, carbon- and sulfur-containing components by roasting in an oxygen-enriched gaseous atmosphere |
| CN1102300A (en) * | 1993-11-04 | 1995-05-10 | 天津市武清县朝阳化工厂 | Preparation method of solbar |
| JP2005111438A (en) * | 2003-10-10 | 2005-04-28 | National Institute Of Advanced Industrial & Technology | Formation of clean gas from biomass waste containing gypsum |
| CN1752010A (en) * | 2005-07-15 | 2006-03-29 | 陆巧芳 | Method of producing barium sulfide and flue gas by calcining coal and barite to synthesize barium carbonate |
| CN100455533C (en) * | 2006-04-21 | 2009-01-28 | 华南理工大学 | A novel masonry cement |
| CN101353233B (en) * | 2008-08-01 | 2010-08-11 | 湖南合磷化工有限公司 | Radiation protection cement and sulphuric acid production method |
| CN102583487A (en) * | 2011-12-30 | 2012-07-18 | 重庆文理学院 | Method for preparing barium chloride by using witherite tailings and barium residues |
| CN102531500A (en) * | 2012-01-06 | 2012-07-04 | 安顺市华洋新型建材有限责任公司 | Barium residue coal ash building block and production method thereof |
| CN102775082A (en) * | 2012-08-17 | 2012-11-14 | 湖南合磷化工有限公司 | Production method of white cement and sulfuric acid |
| CN104058786B (en) * | 2014-07-04 | 2016-01-06 | 武汉理工大学 | A kind of high-performance aerated concrete material of construction utilizing barium slag and preparation method thereof |
| CN105271347B (en) * | 2015-10-16 | 2017-04-12 | 重庆市川渝矿业有限责任公司 | Method for preparing high-purity barium salt by using witherite-barytocalcite industrial waste residues |
| CN105314899B (en) * | 2015-11-25 | 2017-09-29 | 济南大学 | It is a kind of efficiently to utilize the low-heat cement of industrial waste gypsum |
| CN106734056B (en) * | 2016-11-22 | 2018-01-09 | 贵州红星发展大龙锰业有限责任公司 | A kind of barium dregs innocent treatment method |
| CN107597801B (en) * | 2017-09-27 | 2019-07-26 | 中国科学院地球化学研究所 | A method of barium slag is handled using ardealite innocent |
-
2019
- 2019-03-20 CN CN201910211769.0A patent/CN110000187B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110000187A (en) | 2019-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110000187B (en) | Harmless treatment method for barium slag | |
| CN106082646B (en) | The method for cooperateing with melting to prepare glass sand with domestic garbage incineration flyash using electroplating sludge | |
| CN103286116B (en) | Harmless treatment method of electrolytic manganese residue | |
| CN101570341B (en) | Method for utilizing comprehensive resource of sulfur-containing solid waste | |
| CN109575880B (en) | Method for preparing I-type snow melting agent by utilizing garbage fly ash | |
| Wang et al. | Extraction of alumina from fly ash by ammonium hydrogen sulfate roasting technology | |
| CN1895803A (en) | Treatment of aluminum electrolytic-cell waste lining | |
| CN113968716A (en) | Harmless treatment method for electrolytic manganese slag | |
| CN113293299A (en) | Resource utilization method for arsenic-containing hazardous waste | |
| CN110981231A (en) | Equipment and method for cooperatively treating electrolytic manganese slag on basis of dry-process rotary kiln cement production line | |
| CN109647850A (en) | The processing system of collaboration processing incineration of refuse flyash and garbage leachate | |
| CN105385850A (en) | Method for separating and recycling heavy metal in mercury, selenium and arsenic containing dirt acid sludge | |
| Ma et al. | A novel plant-internal route of recycling sulfur from the flue gas desulfurization (FGD) ash through sintering process: From lab-scale principles to industrial practices | |
| CN112875832B (en) | Preparation method of alkaline slow-release material | |
| CN104785519A (en) | Method for in situ fixation of vanadium ore polluted soil by modified charcoal | |
| CN1899971B (en) | Method for extracting V2O5 from stone coal vanadium ore | |
| CN106734146B (en) | Soil heavy metal pollution remediation method | |
| CN105543480A (en) | Method for separation and enrichment of copper and arsenic in copper smelting acidic wastewater | |
| CN115403027A (en) | Preparation method of enhanced phosphorus-rich municipal sludge biochar | |
| CN115093200A (en) | Reinforced electrolytic manganese slag sintered brick and preparation method thereof | |
| Dąbrowska | Fractions of heavy metals in residue after incineration of sewage sludge | |
| CN102923978B (en) | Method for preparing sulphoaluminate cement raw material by using incineration fly ash and formula of sulphoaluminate cement | |
| Zhang et al. | Reuse of waste sulfur from biogas desulfurization for potentially toxic metals stabilization in MSWI fly ash towards zero-waste in venous industry park | |
| CN112404096B (en) | Treatment method for removing ammonia by fixing manganese in electrolytic manganese slag | |
| CN115446096B (en) | Method for preparing blast furnace injection fuel and zinc carbonate by cracking carbon black from waste tires |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |